<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			#div01{
				width: 50px;
				height: 50px;
				background-color: lightblue;
				position: absolute;
				top: 100px;
				left: 100px;
			}
		</style>
	</head>
	<body>
		<div id="div01">
			
		</div>
		<script>
			var moving = false;
			div01.onmousedown = function(){
				console.log('鼠标按下，开始移动');
				moving = true;
				posX = div01.offsetLeft - event.clientX;
				posY = div01.offsetTop - event.clientY;
			}
			div01.onmousemove = function(){
				if(moving){
					div01.style.left = event.clientX + posX + "px";
					div01.style.top = event.clientY + posY + "px";					
				}
			}
			div01.onmouseup = function(){
				moving = false;
			}
		</script>
	</body>
</html>
